Revert "Fix Configure's csym test for gcc's link time optimisation"

There are too many related problems arising from this change

This reverts commit 2a57a95b5cdd39b6d6c1f074c5ed9b9908eb7009.

diff --git a/U/compline/Csym.U b/U/compline/Csym.U
old mode 100755 (executable)
new mode 100644 (file)
index 8648d5a..c9bef1c
--- a/U/compline/Csym.U
+++ b/U/compline/Csym.U
@@ -97,13 +97,13 @@ yes)
                if $contains $tlook $tf >/dev/null 2>&1; then
                        tval=true;
                elif $test "$mistrustnm" = compile -o "$mistrustnm" = run; then
                if $contains $tlook $tf >/dev/null 2>&1; then
                        tval=true;
                elif $test "$mistrustnm" = compile -o "$mistrustnm" = run; then

-                       echo "volatile int dummy = 0; $extern_C void *$1$tdc; void *(*(p()))$tdc { return dummy + &$1; } int main() { if(p()) return(0); else return(1); }"> try.c;
+                       echo "$extern_C void *$1$tdc; void *(*(p()))$tdc { return &$1; } int main() { if(p()) return(0); else return(1); }"> try.c;

                        $cc -o try $optimize $ccflags $ldflags try.c >/dev/null 2>&1 $libs && tval=true;
                        $test "$mistrustnm" = run -a -x try && { $run ./try$_exe >/dev/null 2>&1 || tval=false; };
                        $rm_try;
                fi;
        else
                        $cc -o try $optimize $ccflags $ldflags try.c >/dev/null 2>&1 $libs && tval=true;
                        $test "$mistrustnm" = run -a -x try && { $run ./try$_exe >/dev/null 2>&1 || tval=false; };
                        $rm_try;
                fi;
        else

-               echo "volatile int dummy = 0; $extern_C void *$1$tdc; void *(*(p()))$tdc { return dummy + &$1; } int main() { if(p()) return(0); else return(1); }"> try.c;
+               echo "$extern_C void *$1$tdc; void *(*(p()))$tdc { return &$1; } int main() { if(p()) return(0); else return(1); }"> try.c;

                $cc -o try $optimize $ccflags $ldflags try.c $libs >/dev/null 2>&1 && tval=true;
                $rm_try;
        fi;
                $cc -o try $optimize $ccflags $ldflags try.c $libs >/dev/null 2>&1 && tval=true;
                $rm_try;
        fi;